Most of working dogs breeds can learn how to pull on a dog harness. (fordogtrainers.com)
Most working dog breeds are not going to lie around the house, no matter how much you try to exercise them, and there are only a few on this list. (pethelpful.com)
As such working dogs these breeds developed large and muscular frames to enable them to perform their given tasks with ease. (caninejournal.com)